Mecca is already being destroyed

There has recently been some controversy over Republican Congressman Tom Tancredo's answer to the hypothetical question of how the U.S. should respond to multiple nuclear strikes by Islamic terrorists upon U.S. cities:

"Well, what if you said something like — if this happens in the United States, and we determine that it is the result of extremist, fundamentalist Muslims, you know, you could take out their holy sites," Tancredo answered.
"You're talking about bombing Mecca," Campbell said.
"Yeah," Tancredo responded.

It may come as a surprise to learn that historical Mecca is already being destroyed by fundamentalist Islamists. Mathaba News carried this report originally published in the Independent Online:

Historic Mecca, the cradle of Islam, is being buried in an unprecedented onslaught by religious zealots.
Almost all of the rich and multi-layered history of the holy city is gone. The Washington-based Gulf Institute estimates that 95 per cent of millennium-old buildings have been demolished in the past two decades...
A Saudi architect, Sami Angawi, who is an acknowledged specialist on the region's Islamic architecture, told The Independent that the final farewell to Mecca is imminent: "What we are witnessing are the last days of Mecca and Medina."
According to Dr Angawi - who has dedicated his life to preserving Islam's two holiest cities - as few as 20 structures are left that date back to the lifetime of the Prophet 1,400 years ago and those that remain could be bulldozed at any time. "This is the end of history in Mecca and Medina and the end of their future..."
The motive behind the destruction is the Wahhabists' fanatical fear that places of historical and religious interest could give rise to idolatry or polytheism, the worship of multiple and potentially equal gods.

It appears that holy sites aren't revered by the Wahhabis in the same manner as that of Western Christians.